এই ক্লাস দশমিক অঙ্ক (decimal digits) ০ থেকে ৯ পর্যন্ত ম্যাচ করে।
উদাহরণ ১
import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class DigitsExample {
public static void main(String args[]) {
System.out.println("Enter a string");
Scanner sc = new Scanner(System.in);
String input = sc.nextLine();
String regex = "[\\p{Digit}]";
Pattern pattern = Pattern.compile(regex);
Matcher matcher = pattern.matcher(input);
int count = 0;
while(matcher.find()) {
count++;
}
System.out.println("Number of digits: " + count);
}
}আউটপুট ১
Enter a string sample text 22 37 48 84 Number of digits: 8
আউটপুট ২
Enter a string Welcome to tutorilspoint Number of digits: 0
উদাহরণ ২
import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Example {
public static void main(String args[]) {
String regex = "^\\p{Digit}+$";
Scanner sc = new Scanner(System.in);
System.out.println("Enter 5 input strings: ");
String input[] = new String[5];
for (int i = 0; i < 5; i++) {
input[i] = sc.nextLine();
}
Pattern p = Pattern.compile(regex);
System.out.println("Strings with only digits: ");
for(int i = 0; i < 5; i++) {
Matcher m = p.matcher(input[i]);
if(m.matches()) {
System.out.println(m.group());
}
}
}
}আউটপুট
Enter 5 input strings: hello 1234 243test ##$$@ 222356 Strings with only digits: 1234 222356
